It was believed by many ancients that women had sperm emissions at orgasm. ( Alcmaeon (about 500 B.C.) believed the sex of a child was determined by whose semen was most abundant. Democritus of Abdera (5th century B.C.), Aristotle (4th century B. C.), Galen (2nd century B.C.), and Lucretius (1st century B.C.), believed that during sexual intercourse the female expelled sperm from her ovaries that mixed in the womb with the male sperm to produce an embryo)
Jewish writers and Rabbis naturally accepted this 'scientific' view. For instance :
Lev 12:2
When a woman tazria and bears a male child, then she shall be unclean seven days."
The root of tazria is ZR, which means to sow (a seed). When a form of ZR means "to become pregnant, to be impregnated," the form tazara (the niphal or passive form) is always used . In Leviticus the causative (hiphil) is used.
Hebrews 11: 11 By faith also Sarah herself did lay down seed, and she bare after the time of life, seeing she did judge Him faithful who did promise..
The Greek here is 'katabole spermatos', was the technical term for a male seminal emission.